We look at the division of 434140 by 87 
The aim is to understand the frequency of 87 in 434140.

Going ahead to step 1:
When dividing 4 by 87, we get 0 with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Bring next digit (3) of the dividend behind the 4 and repeat the process: 43 / 87

Advancing to step 2:
If we divide 43 by 87, we get 0 and a remainder of 43.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 43 to get 43.
Bring next digit (4) of the dividend behind the 43 and repeat the process: 434 / 87

Step 3:
If we divide 434 by 87, we get 4 and a remainder of 86.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtracting 348 from 434 leaves us with 86.
Fetch the next digit (1) from the dividend, attach it to 86 and continue: 861 / 87

Moving on to step 4:
The number 87 fits into 861 9 times, leaving a remainder of 78.
The number 9 becomes the next digit in our result. 
Result so far: 49.0
If we subtract 783 from 861, we get 78.
Append the next digit (4) from the dividend to 78 and continue with: 784 / 87

Going ahead to step 5:
784 divided by 87 is 9 with a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 499.0
Deduct 783 from 784 and we're left with 1.
Take the next digit (0) from the dividend and append it to 1, then repeat: 10 / 87

Moving on to step 6:
87 goes into 10 0 times with a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 4990.0
Subtract 0 from 10 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 7:
When dividing 100 by 87, we get 1 with a remainder of 13.
The number 1 becomes the next digit in our result. 
Result so far: 4990.1
If we subtract 87 from 100, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Moving on to step 8:
The number 87 fits into 130 1 times, leaving a remainder of 43.
The next digit of our result is 1. 
Result so far: 4990.11
The remainder is 43 after subtracting 87 from 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

After the division, we end up with 4990.11 and a remainder of 0.043.